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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.I like what Sister Ping said: "I like to do one thing instead of insisting on doing one thing." Many people say that one must stick to it. If it grows in your blood and is as natural as eating and sleeping, it does not need to "stick to it" and just do it. Saying "stick to" is because you don't love enough, so you need to remind yourself all the time.当他感到失望时，他们相遇了。错误是由亲密关系引起的，他们的关系也不清楚。最后会怎样？与《学长的爱情攻心计》(2020)类似的故事。讲述Mark和vee之间的完整故事。《Love Mechanics》的时间线是在Neur遇到Praram之前。这部将会有他和Mark的感情。The commands in the defined CMD will not be executed, but the command of command will be executed.刘副将军狐疑地打量顾涧，却不好开口问的。